package com.atguigu.gulimall.search.service.impl;

import cn.hutool.core.lang.Console;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVO;
import com.atguigu.gulimall.search.vo.BrandVO;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import lombok.extern.slf4j.Slf4j;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author wzb
 * @version V1.0
 * @Package com.atguigu.gulimall.search.service.impl
 * @date 2022-07-22 15:08
 * @Copyright ©
 */
@Service
@Slf4j
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    RestHighLevelClient client;

    @Autowired
    ProductFeignService productFeignService;


    //去es进行检索
    @Override
    public SearchResult search(SearchParam param) {
        // 1、动态构建出查询需要的DSL语句
        SearchResult result = null;

        // 1、准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);


        try {
            // 2、执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            result = buildSearchResult(response, param);
            // 3、分析响应数据，封装成我们需要的格式
        } catch (IOException e) {
            e.printStackTrace();
        }


        return result;
    }


    /**
     * 准备检索请求
     * 模糊匹配  过滤(按照属性、分类、品牌、价格区间、库存), 排序  分页  高亮  聚合分析
     *
     * @return SearchRequest
     */
    private SearchRequest buildSearchRequest(SearchParam param) {

        //构建DSL语句
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        /**
         *查询： 过滤(按照属性、分类、品牌、价格区间、库存),
         */
        // 1、构建bool query
        BoolQueryBuilder boolQuery = new BoolQueryBuilder();
        // 1、1 must-模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }

        //1、2 bool -filter  按照三级分类id查询
        if (null != param.getCatalog3Id()) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        //1、2 bool -filter  按照品牌id查询
        if(null != param.getBrandId() && param.getBrandId().size() >0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }
        //1、2 bool -filter  按照所有指定的属性进行查询
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {

            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                String[] s = attrStr.split("_");
                String attrId = s[0];
                String[] attrValue = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValue));

                //每一个必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }

        }

        //1、2 bool -filter  按照库存是否有进行查询
        if (param.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }

        //1、2 bool -filter  按照价格区间查询
        if (!StringUtils.isEmpty(param.getSkuPrice())) {

            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] s = param.getSkuPrice().split("_");
            if (s.length == 2) {
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            } else if (s.length == 1) {
                if (param.getSkuPrice().startsWith("_")) {
                    rangeQuery.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")) {
                    rangeQuery.gte(s[0]);
                }

            }

            boolQuery.filter(rangeQuery);
        }

        //把以前的所有条件都拿进来进行封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序  分页  高亮
         */
        // 2、1 排序
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;

            sourceBuilder.sort(s[0], order);
        }

        // 2、2分页
        // (pageNum-1) * size
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        // 2、3高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");

            sourceBuilder.highlighter(highlightBuilder);
        }

        /**
         * 聚合分析
         */

        // 1、品牌聚合
        TermsAggregationBuilder brandAgg = AggregationBuilders.terms("brand_agg");
        brandAgg.field("brandId").size(50);

        // 品牌聚合的子聚合
        brandAgg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brandAgg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        // TODO: 1、聚合 brand
        sourceBuilder.aggregation(brandAgg);

        // 2、分类聚合  catalog_agg
        TermsAggregationBuilder catalogAgg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalogAgg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        // TODO: 2、聚合 catalog
        sourceBuilder.aggregation(catalogAgg);

        // 3、属性聚合
        NestedAggregationBuilder attrAgg = AggregationBuilders.nested("attr_agg", "attrs");

        // 聚合出当前所有的attrId
        TermsAggregationBuilder attrIdAgg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        // 聚合分析当前attrId对应的名字
        attrIdAgg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        // 聚合分析当前attrId对应的所有可能的属性值
        attrIdAgg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attrAgg.subAggregation(attrIdAgg);
        // TODO: 3、聚合 attr
        sourceBuilder.aggregation(attrAgg);

        String s = sourceBuilder.toString();
        Console.log("构建的DSL:{}", s);


        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }



    /**
     * 构建结果数据
     *
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {

        SearchResult result = new SearchResult();


        // 1、返回的所有查询到的商品
        List<SkuEsModel> esModels = new ArrayList<>();
        SearchHits hits = response.getHits();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
        }
        result.setProduct(esModels);

        // 2、当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVO> attrVOS = new ArrayList<>();
        ParsedNested attrAgg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attrIdAgg = attrAgg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attrIdAgg.getBuckets()) {
            SearchResult.AttrVO attrVO = new SearchResult.AttrVO();

            // 1、得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            // 2、得到属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            // 3、得到属性的所有值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String attrValue = item.getKeyAsString();
                return attrValue;
            }).collect(Collectors.toList());
            attrVO.setAttrId(attrId);
            attrVO.setAttrName(attrName);
            attrVO.setAttrValue(attrValues);



            attrVOS.add(attrVO);
        }
        result.setAttrs(attrVOS);

        // 3、当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVO> brandVOS = new ArrayList<>();
        ParsedLongTerms brandAgg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brandAgg.getBuckets()) {
            SearchResult.BrandVO brandVO = new SearchResult.BrandVO();
            //1、得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVO.setBrandId(brandId);
            //2、得到品牌的名称
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVO.setBrandName(brandName);
            //3、得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVO.setBrandImg(brandImg);
            brandVOS.add(brandVO);
        }
        result.setBrands(brandVOS);

        // 4、当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalogAgg = response.getAggregations().get("catalog_agg");

        List<SearchResult.CatalogVO> catalogVOS = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalogAgg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVO catalogVO = new SearchResult.CatalogVO();

            //得到分类ID
            String keyAsString = bucket.getKeyAsString();
            catalogVO.setCatalogId(Long.parseLong(keyAsString));

            //得到分类名
            ParsedStringTerms catalogNameAgg = bucket.getAggregations().get("catalog_name_agg");
            String catalogName = catalogNameAgg.getBuckets().get(0).getKeyAsString();
            catalogVO.setCatalogName(catalogName);
            catalogVOS.add(catalogVO);
        }
        result.setCatalogs(catalogVOS);


        // 5、分页信息  页码(计算) 总记录数  总页码
        long total = hits.getTotalHits().value;
        int totalPages = (int) (total % EsConstant.PRODUCT_PAGESIZE == 0 ? total / EsConstant.PRODUCT_PAGESIZE : (total / EsConstant.PRODUCT_PAGESIZE + 1));
        result.setPageNum(param.getPageNum());
        result.setTotal(total);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);


        // 6、构建面包屑导航功能
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            List<SearchResult.NavVO> navVOS = param.getAttrs().stream().map(attr -> {
                // 1、分析每个attrs传过来的查询参数值
                SearchResult.NavVO navVO = new SearchResult.NavVO();

                String[] s = attr.split("_");
                navVO.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrResponseVO data = r.getData("attr", new TypeReference<AttrResponseVO>() {
                    });
                    navVO.setNavName(data.getAttrName());
                } else {
                    navVO.setNavName(s[0]);
                }

                // 2、取消了这个面包屑以后，我们要跳转到那个地方,将当前请求地址的url里面的当前置空
                // 拿到所有的查询条件，去掉当前
                String replace = replaceQueryString(param, attr, "attrs");
                navVO.setLink("http://search.gulimall.com/list.html?" + replace);

                return navVO;
            }).collect(Collectors.toList());


            result.setNavs(navVOS);


        }
        // 品牌 分类
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            List<SearchResult.NavVO> navs = result.getNavs();
            SearchResult.NavVO navVO = new SearchResult.NavVO();
            navVO.setNavName("品牌");
            // TODO: 远程查询所有品牌
            R r = productFeignService.brandsInfo(param.getBrandId());
            if (r.getCode() == 0) {
                List<BrandVO> brand = r.getData("brand", new TypeReference<List<BrandVO>>() {
                });

                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVO brandVO : brand) {
                    buffer.append(brandVO.getBrandName() + ";");
                    replace  = replaceQueryString(param, brandVO.getBrandId() + "", "brandId");
                }
                navVO.setNavValue(buffer.toString());
                navVO.setLink("http://search.gulimall.com/list.html?" + replace);
            }
            navs.add(navVO);
        }

        // TODO: 分类：不需要导航取消




        return result;
    }

    private String replaceQueryString(SearchParam param, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode = encode.replace("+", "%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        String replace = param.get_queryString().replace("&" + key + "=" + encode, "");
        return replace;
    }

}